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Well, the easiest way to reverse the polarity of a magnet is to just turn it around. However, inside of every piece of steel, there are magnetized pieces that will make the steel an induced magnet when a magnet is placed on or by the steel. By putting the oppositely polarized magnet on or by the same steel, you may be able to reverse the magnetism of the steel. Or by making it a core of a coil in which direct current flows in such a direction as to re-polarize it
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∙ 15y ago
Wiki User
∙ 11y agoDC change the leads source. AC has no polarity since is both positive and negative at some time
AC or alternating current does not need to switch polarity, because the polarity is constantly switching, see [http://en.wikipedia.org/wiki/Alternating_current http://en.wikipedia.org/wiki/Alternating_current] for more on this subject. An example of AC is an electrical outlet. With DC or direct current the polarity is constant so it may sometimes need switching, to do this one only needs to exchange positive and negative contacts on the power supply. See [http://en.wikipedia.org/wiki/Direct_current http://en.wikipedia.org/wiki/Direct_current] for more on this subject. An example of DC is a battery.
Wiki User
∙ 8y agoIf it is an electromagnet then just reversing the direction of current we can change the polarity. You can't reverse a permanent-magnet's polarity, at least not without the equipment its manufacturer used.
Wiki User
∙ 9y agoYou don't reverse the polarity of an electrical outlet. In North America, the ground pin is on the bottom with the neutral on the left side and the "hot" on the right side of the receptacle outlet.
Wiki User
∙ 15y agoInterchange the positive and negative direct current connections.
Wiki User
∙ 14y agoSwitch the polarity of it. If it's DC, then swap your + and - wires.
Wiki User
∙ 9y agoAn electrical outlet has the output wires in a specified position and this should not be altered because to do so would be dangerous and might invalidate insurance.
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Does a compass point true north magnetic north or at the north pole?
North Star points at True North, you can use a compass and north star to see how far off magnetic north is from your location. .
What characteristic of iron would make it a bad material for housing a compass?
It is magnetic and would throw off your little dial
Why does a compass needle always point to magetic north?
The simple answer is that the magnetized needle is being attracted by the North Magnetic Pole (which is close to, but not the same as the geographic North Pole).However, the colored part of the needle is not actually drawn to the North, although that would be the result of unlike charges being drawn together. The actual effect is that the needle aligns itself with the parallel lines of magnetism connecting the North and South magnetic poles, so that it lines up North and South, its northern end pointed north and its southern end pointed south.The Earth's magnetic field is generated by the movement of its iron core in relation to the crust.No matter where you stand on Earth, you can hold a compass in your hand and it will point toward the North Pole. What an unbelievably neat and amazing thing! Imagine that you are in the middle of the ocean, and you are looking all around you in every direction and all you can see is water, and it is overcast so you cannot see the sun... How in the world would you know which way to go unless you had a compass to tell you which way is "up"? Long before GPS satellites and other high-tech navigational aids, the compass gave humans an easy and inexpensive way to orient themselves.But what makes a compass work the way it does? And why is it useful for detecting small magnetic fields, as we saw in How Electromagnets Work? In this article, we will answer all of these questions, and we'll also see how to create a compass from scratch!A compass is an extremely simple device. A magnetic compass (as opposed to a gyroscopic compass) consists of a small, lightweight magnet balanced on a nearly frictionless pivot point. The magnet is generally called a needle. One end of the needle is often marked "N," for north, or colored in some way to indicate that it points toward north. On the surface, that's all there is to a compass.The reason why a compass works is more interesting. It turns out that you can think of the Earth as having a gigantic bar magnet buried inside. In order for the north end of the compass to point toward the North Pole, you have to assume that the buried bar magnet has its south end at the North Pole, as shown in the diagram at the right. If you think of the world this way, then you can see that the normal "opposites attract" rule of magnets would cause the north end of the compass needle to point toward the south end of the buried bar magnet. So the compass points toward the North Pole.To be completely accurate, the bar magnet does not run exactly along the Earth's rotational axis. It is skewed slightly off center. This skew is called the declination, and most good maps indicate what the declination is in different areas (since it changes a little depending on where you are on the planet).The magnetic field of the Earth is fairly weak on the surface. After all, the planet Earth is almost 8,000 miles in diameter, so the magnetic field has to travel a long way to affect your compass. That is why a compass needs to have a lightweight magnet and a frictionless bearing. Otherwise, there just isn't enough strength in the Earth's magnetic field to turn the needle.The "big bar magnet buried in the core" analogy works to explain why the Earth has a magnetic field, but obviously that is not what is really happening. So what is really happening?No one knows for sure, but there is a working theory currently making the rounds. As seen on the above, the Earth's core is thought to consist largely of molten iron (red). But at the very core, the pressure is so great that this superhot iron crystallizes into a solid. Convection caused by heat radiating from the core, along with the rotation of the Earth, causes the liquid iron to move in a rotational pattern. It is believed that these rotational forces in the liquid iron layer lead to weak magnetic forces around the axis of spin.It turns out that because the Earth's magnetic field is so weak, a compass is nothing but a detector for very slight magnetic fields created by anything. That is why we can use a compass to detect the small magnetic field produced by a wire carrying a currentThe Core of our earth is molten iron, and it's spinning really friggen fast. That spin of the iron creates a large electro-magnetic field. Similar to a small bar magnet, it has two poles. The needle in the compas will be attracted to the pull of the northpoleansw2. your compass needle just aligns itself with the lines of magnetic force in your vicinity. Which in turn are influenced by the position of the poles.because of the poles magnetic fieldA compass needle aligns itself to the earth's magnetic field. The direction of the earth's magnetic extends from the earth's Magnetic South to its Magnetic North. Remember, the terms 'Magnetic North' and 'Magnetic South' refer to LOCATIONS in the Arctic and Antarctic, respectively, and not to the magnetic polarities at these locations. Because 'unlike poles attract', this means that the polarity of Magnetic North is a south pole, thus attracting the north (coloured) pole of a compass needle.The iron core of the Earth acts like a giant bar magnet buried in the Earth.Since that giant bar magnet is pointing South, opposites attract and the magnetized needle points North.
The north pole of a compass magnet points toward?
The north pole of a compass magnet points more or less towards the north.Since opposite poles of a magnet attract, that means that the north pole of the magnet points towards Earth's magnetic south pole, which of course is located towards the north. Confusingly, this magnetic south pole has often been called the magnetic NORTH pole, precisely because it is located towards the north.
What happen to a electromagnet if you switch the current off?
When we turn of the current in an electromagnet then electromagnet looses its magnetic property,provided the material used inside the current carrying solenoid is soft iron core. If, the material is steel then after the current is turned the magnetism propety still prevails and hence steel becomes a permanent magnet.
Would reverse polarity cause equipment to run even if switch is off?
The case of reverse polarity would only happen on a DC system. As to would it cause equipment to run when switched off, no, if the switch opens the equipment's power supply completely the device will not operate.
Turn radio up and door speakers go off bass speakers stay on?
sounds like you reached the peak of your radio but it might be the fact that you have your speakers installed in reverse polarity seen that happen in a maxima before turn it all the way up sound cuts off but subs stayed on. the owner replaced the speakers and wired them up in reverse polarity
What can be done with an electromagnet that cannot be done with a regular permanent magnet?
Its strength can be easily manipulated (e.g. you can switch it off). Or the strength can be varied with the current. Electromagnets can reverse polarity (by reversing the current).
How much is 15 percent off of 180?
15% off of 180 = 15315% off of 180= 15% discount applied to 180= 180 - (15% * 180)= 180 - (0.15 * 180)= 180 - 27= 153
What is reverse polarity in welding?
This is applicable to DC supply Arc Welding.In Layman language, when the electrode is given positive potential and the work piece is given negative potential, the weld formed is shallow and wide, this method is called 'Direct Current Reverse Polarity' (DCRP) welding procedure.When the machine is set on straight polarity, the electrons flow from the electrode to the plate, concentrating most of the heat on the work. With reverse polarity, the flow of electrons is from the plate to the electrode, thus causing a greater concentration of heat at the electrode. Because of this intense heat, the electrode tends to melt off; therefore, direct current reverse polarity (DCRP) requires a larger diameter electrode than direct current straight polarity (DCSP). Notice that DCSP produces a narrow, deep weld. Since the heat is concentrated on the work, the welding process is more rapid and there is less distortion of the base metal. Overall, straight polarity is preferred over reverse polarity because you can achieve better welds. DCRP forms a wide and shallow weld and is rarely used in the GTAW process. The exception to this is when it is used to weld sections of aluminum or magnesium.DCRP has excellent cleaning power that results from the action of positive charged gas ions. When these gas ions strike the metal, they pierce the oxide film and form a path for the welding current to follow. This same cleaning action occurs in the reverse polarity half of an alternating current welding cycle.
How is earth like a compass?
magnetic pull which is what the compass works off of.
What is 60 of 180?
60 of 180 = 60 x 180 = 10,80060% of 180 = 180 x 0.6 = 10860% off 180 = 180 x 0.4 = 7260 off 180 = 180 - 60 = 120
How do maglev trains slow down?
You slowly decrease the power of the electromagnets.
What is 10 percent off 180.00?
10% off 180= 10% discount applied to 180= 180 - (10% * 180)= 180 - 18= 162
How do you upgrade a 2 wire actuator to a 3 wire actuator on a 95 Chevy pickup?
If it is a factory doorlock system you want to keep using a two wire because the locks work off of reverse polarity
How does the earth act like a compass?
magnetic pull which is what the compass works off of.
What is 10 percent off of 180?
162= 180 - (10%/100% * 180)= 180 - (1/10 * 180)= 180 - (0.1 * 180)= 180 - 18= 162
